Abstract: Method for improving the organoleptic qualities of the meat from uncastrated male domestic animals, vaccines which are usable in this method, new peptide, in particular, for producing these vaccines and vaccination kit relating thereto.The method for improving the organoleptic qualities, especially the smell, taste and tenderness, of the meat from uncastrated male domestic animals comprises, shortly before slaughter of the animal in question, abolition of the action of the androgenic and non-androgenic steroids by active or passive anti-LHRH immunoneutralization, while the advantages linked to the male character of the animal are maintained virtually up to slaughter. The vaccines comprise, as a peptide, natural LHRH or a peptide of formula Trp - Ser - Tyr - Gly - Leu - Arg - Pro - Gly - NH.sub.2, coupled to an immunogenic carrier protein.